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x in (-oo:+oo)
21-(x/3) = x/4 // - x/4
21-(x/3)-(x/4) = 0
21-7/12*x = 0 // - 21
-7/12*x = -21 // : -7/12
x = -21/(-7/12)
x = 36
x = 36
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